Diagnose a vibration.

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Aug 3, 2013 | 07:08 AM

timgman

Thread Starter

Burning Brakes

Joined: Jul 2006

Posts: 833

Likes: 4

From: Mexico NY

Diagnose a vibration.

After searching through the forum on vibration, I'm slightly educated..
so I thught I'd throw this theory on my problem out here and get some advise.
My 77 has a fairly serious vibration at speeds above 40 mph.
If I'm within ' the vibrating speed range (say 65 mph) and I put it in neutral it stops immediately. If I rev the engine in neutral or at a stop there's not excessive vibration.
So, should I start looking at u joints?

ie: is a vibration that goes away in "N" a driveline / U joint issue?

Thanks to you all for helping me keep this thing running all these years.

Aug 3, 2013 | 07:08 AM

timgman

Thread Starter

Burning Brakes

Joined: Jul 2006

Posts: 833

Likes: 4

From: Mexico NY

Quote:

Originally Posted by timgman

Also, From waht I've read a bad engine tune could cause this.. Is that a possibility?

Aug 3, 2013 | 11:40 AM

gcusmano74

Drifting

Joined: Mar 2011

Posts: 1,886

Likes: 9

I would imagine you have a broken accessory bracket. Look carefully at the PS, alternator, AC mounts, etc.

Aug 3, 2013 | 02:56 PM

timgman

Thread Starter

Burning Brakes

Joined: Jul 2006

Posts: 833

Likes: 4

From: Mexico NY

Quote:

Originally Posted by gcusmano74

I would imagine you have a broken accessory bracket. Look carefully at the PS, alternator, AC mounts, etc.

Will do. Thanks for a pointer bud!

Aug 3, 2013 | 03:02 PM

MelWff

Race Director

Joined: May 2006

Posts: 18,735

Likes: 2,582

It's engine related. check the harmonic damper to make sure the outter ring hasnt shifted. check the engine fan and fan clutch for anything loose.

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